Finding the Fourth Proportional to 20,315.34, 30,464.91 and 7,828.43

Step by Step Solution

1. Step 1: Write the proportion equation
   20,315.34 : 30,464.91 = 7,828.43 : x
2. Step 2: Convert to fraction form
   20,315.34/30,464.91 = 7,828.43/x
3. Step 3: Cross multiply
   20,315.34x = 30,464.91 × 7,828.43
4. Step 4: Simplify right side
   20,315.34x = 238,492,263.07
5. Step 5: Solve for x
   x = 238,492,263.07/20,315.34
6. Step 6: Final answer
   x = 11,739.52